Derith Cass, a fitness trainer at The Houstonian Club at the Houstonian Hotel

Derith Cass, a fitness trainer at The Houstonian Club at the Houstonian Hotel

Photo: Joy Sewing

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Guests in the lobby at the Houstonian in 2011.

Guests in the lobby at the Houstonian in 2011.

Photo: Smiley N. Pool, Houston Chronicle

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The second-floor veranda at Trellis Spa at The Houstonian

The second-floor veranda at Trellis Spa at The Houstonian

Photo: The Houstonian Hotel, Club & Spa

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A group of guests crosses from the spa to the hotel at the Houstonian in 2011.

A group of guests crosses from the spa to the hotel at the Houstonian in 2011.

Photo: Smiley N. Pool, Houston Chronicle

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Cyber attack hits guests at Houstonian Hotel

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At least 10,000 customers of the Houstonian Hotel, Club & Spa have been notified that the hotel's credit card processing system was breached for six months between last December and June 20.

The hotel has emailed 10,000 guests about the security hack. "We have collected all the relevant data and are working closely with the Secret Service and the Houston Police Department to assist in their investigations," according to the email from hotel management.